Improvement in ships  logs



2 Sheets-Sheet 1. D. & R. RIGGS.

SHIPS LOG. Patented April 25, 1876.

N-PEI'ERS, FHOTO-LITHOGRAPMER. WASHINGTON. D. C.

- removed from the bowl and inverted.

DANIEL RIGGS AND ROBERT RIGGS,

PATENT mes.

0F PHILADELPHIA, PENNSYLVANIA.

\ s 4 IMPROVEMENT IN sHiPs LOGS.

Specification forming part of Letters Patent No. 176,687, dated April 26, 1576 application filed November 23, 1875).

To all whom it may concern v Be it-known that We, DANIEL RIGGS and ROBERT RIGGS, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Ships Logs; and we do hereby declare the following to be a full, clear. andexact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification, in Which Figure l is a perspective; Fig. 2, a vertical section of the bowl and registering apparatus. Fig. 3 is a plan of the registering apparatus Fig. 4 is a perspective of the bowl, its support and the registeringapparatus partly in section. Fig.6 is a perspective of the main registershaft, ring, andanti-friction rollers The object of this invention is to simplify and improve the efficiency, while reducing the expense, of that class of nautical logs in which a winged propeller is combined, by means of a-cord, with a registering apparatus, the pro peller'being'overboard, while the register is secured to the rail of the vessel.

The invention consists in certain details of construction and the combination of parts,

which, being first clearly described, are spe cificall y set forth in the claim.

Referring to the accompanyingdrawing, A shows a bowl or case, hung inchronometer or universal-joint bearings B B B B, supported on a centralpedestal', 0, having a conical or be'veled base, 0, which slides under a bracket, D, screwed to the rail of the vessel. E represents a hinged clamp, by means of which the base 0 is held fast in the bracket D. F represents a propeller, composed of right-hand blades f f f, secured to a thimble, f made fast'on a shaft, f. G is a weight or sinker, swiveled on the shaft f so as not to rotate with the latter. The blades f .trcnd or curve downwardly as they recede, so that the water passing under them, as the propeller moves forward, has a lifting tendency, causing said. propeller to move easily and perfectly at any and every rate of speed. H represents a cord connecting the propeller with the registering apparatus, being attached at one end to the shaft f and at the other to the S-shaped hook h, which passes through an eye, 7;, in the short sleeve I, screwed on the end of the main registor-shaft K. L represents an oil-cup, having an annular flange, l, by means of which said cup is made fast in the bowl A by screws 1 a hollow boss, Z projecting, as shown, through the bottom of said bowl, and forming a hearing for the shaft K. M is a ring, fitting in the oil-cu'p- L, and having anti-friction rollers m journaled on its periphery, as shown, said roll ers being of sufficient diameter to extend both above and below the ring M. Y K is formed with a disk, k, which serves as a cap for the oil'cup L, said disk sustaining a stud or pin, it. to uprights n 'it; and O is a vertical shaft, having its bearings in said disks, and provided- 'with a left-hand screw, 0, at or about its middle part,'and with the tworigid arms 0 0 at its lower'extremity. The revolution of the shaft K causes the stud k to strike one or either of the arms 0 0, and thus produce a revolution of the sh aft 0. The rotary motion of the shaft 0 is thence communicated, by the worm or screw 0, to the pinion P, fast on the shaft 12; thence through the right-hand worm or screw p, on said latter shaft, to the pinion R and the wheels 1", S, s, and T, the'dial-finger U being made'fast,in the usual manner, to the shaft t of the latter wheel. The disk N is made secure by screws n passing into brackets to a, fixed to the walls of the bowl A. Vrepresents the dial, and W a glass cap or case, forming a covering for the bowl A.

The operation is as follows: The registering apparatus being made fast, as already described, to the rail of the vessel, the propeller F is thrown overboard, being connected, by

means of the cord'H, with the hook h. The forward movement of the vessel produces a rotation of the propeller, which motion is transmitted to the finger U, the movement of said finger over the dial indicating the number of miles traveled. The dial,-it will be observed, is nnmbere up to one thousand. If desired, an additional wheel and dial, the latter exhibiting its numbers through the dial 1], may be employed, though we do not deem such addition necessary.

The mai'n'shat't N N are two disks, fastened By combining a right-hand propeller with a left-hand screw, 0, or vice'versa, two otherwise necessary wheels are dispensed with; the oil-cup prevents the lubricant from running into the bowl; the rollers m m relieve the strain of the shaft K, and reduce the friction. By employing two arms, 0 0, when the hand is turned back the pin k is met after only a quarter revolution, While the general simplicity and small number of gear-wheels permit the construction, at'slight expense, of a very thorough and efiiicient .automatic' log, using only one dial, on which the number of miles run is indicated by a single hand.

The shaftKand rollersmm are oiled through a small opening, P, in the cup L.

What we claim as our invention is-- The combination, in a ships log or speedmeasure, of the following. instrumentalities, viz., the propeller F, sinker Gr, cord H, shaft K, with disk It and pin 70, communicating motion' to the registering gearing and mechanism, substantially as' shown and described.

In testimony that we claim the foregoing we have hereunto set our hands and seals this G. G. TEANY, (J. W. HUMPHREYS. 

